a few tips for you ( I will say I can not use an
ECV but I do go a lot with a friend that use one)
1 when she did rent her ECV she would spend 5-10 minutes at the resort seeing how it stoped started turned ( she said ever ECV was a little different) and the few minutes really made a big difference fro her. If you are taking the Disney busses pratice partial parking.
2 we always try to be at the back of RD, My friend says driving an ECV in a crowded area is the most stressful thing, so hang back a bit and go slow the rides will not go away. ( we were waiting at HS near the back before opening and talking to a CM he ended up giving us 2 any time FP just out of the blue, )
3 people will not see you ( and some will have a disability where they quiet literally can not see you) so be prepared to stop suddenly, MY friend will just smile at people that cut her off.
4 Most rides you can take you ECV in but you can down load the Map for people with disability from disney ( at the bottom of the page)
https://disneyworld.disney.go.com/guest-services/guests-with-disabilities/ There are a few that you can not take your ECV in you will be give a way to access the ride either by using a wheel chair, having a return time ticket, going thought the exit, or another way. ( the CM at the ride will let you know)
5 even thought my friend and I go all the time to disney she will smile at the CM when entering any line as one day the line will be ECV accessible and the next it will not be ( dose not happened to often) and really CM need some pixie dust too and what better way then a smile.
6 My friend uses glow stick at night so people see her ECV. Be careful of the light on the ECV as they are at the right hight for a child in a stroller or little one walking. I have another friend the has a head lap around her basket and aimed at the ground right in front of her ECV. but your want some light ( and you can get a good amount of glow stick for a dollar at the dollar store and how dose not like glow stick.
oh one more thing I would take your ECV in all lines with you even if you have a FP as some times something can happen ( they need to add another car to the track, someone take a little longer loading, things like this) and your 10 minute FP line can turn into 15 or more. If you need to get out and walk park your ECV and walk around a store, or stand for a bit while watching the parade.
This reminds me of another thing turn it off ( The ECV) when sitting still for any amount of time ( even when you are in line) the ECV should last all day but only if you turn it off) you can bring the plug with you and charge it if need be.
I think that is all that I can think of Have a great trip